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ruby red grapefruit tree

If you love the vibrant taste and colour of ruby red grapefruit, the Grapefruit 'Star Ruby' is an outstanding choice for New Zealand home gardens and orchards. This ruby red grapefruit tree is prized for its exceptionally sweet, deep red, seedless fruit and handsome evergreen foliage. Whether you’re a citrus enthusiast or looking to grow your own vitamin-rich breakfast fruit, 'Star Ruby' rewards growers with glossy leaves, fragrant blossoms, and heavy crops that ripen through late winter into spring. This variety thrives in sheltered, sunny spots and is well-suited to containers, smaller gardens, or orchard rows.

Grapefruit 'Star Ruby'

Grapefruit 'Star Ruby' is a variety of grapefruit that produces good yields of medium-sized, golden coloured fruit that are mostly seedless. The flesh is red, juicy, and has a pleasant flavour. The fruit ripens from winter to spring and is often used as a breakfast fruit, for juicing, or in marmalade. It grows densely with glossy, dark green foliage, reaching about 3 m in height and the same width. Grapefruit 'Star Ruby' is commonly grown for fruit production, but also makes a lovely addition to a mixed planting and can be maintained in a large container.

Grapefruit 'Star Ruby' fruit with red flesh.
  • Suited to regions:
    Subtropical, Temperate
  • Plant type:
    Citrus
  • Height:
    3.00 m
  • Spread:
    3.00 m
  • Flowering time:
    Summer
  • Garden uses:
    Containers, Pool areas, Screening
  • Garden styles:
    Backyard, City & Courtyard, Frontyard, Japanese, Modern
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Grapefruit 'Star Ruby'

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Why Plant a Ruby Red Grapefruit Tree?

The Grapefruit 'Star Ruby' stands out for its brilliant red flesh and balanced flavour—less bitterness, more sweetness, and juicier than classic yellow grapefruits. This makes it a popular choice for eating fresh, juicing, or adding a splash of colour to salads and desserts. The ruby red grapefruit tree is also highly ornamental, with lush dark leaves and fragrant, white blossom in spring that will attract pollinators to your garden.

If you enjoy experimenting with different citrus, you may also want to explore Grapefruit 'Cutlers Red' for another rich-flavoured pink variety, or try the classic Grapefruit 'Golden Special' with its golden-hued fruit. Those interested in seedless cultivars might like Grapefruit 'Morrison's Seedless', which offers easy eating straight from the tree.

Growing Conditions and Care

Plant your ruby red grapefruit tree in a position with full sun, shelter from strong winds, and well-draining soil. Like all citrus in New Zealand, protect from harsh winter frosts–plants will benefit from a north-facing wall or spot where the coldest winds are blocked. Grapefruit 'Star Ruby' trees do best with regular watering during dry spells, and seasonal feeding with citrus fertiliser will promote healthier fruit and foliage.

Container growing is a popular option for those in colder climates or limited space; just ensure your pot has adequate drainage, and consider bringing the tree under cover during the coldest weeks of the year. Mulching around the base helps retain soil moisture through summer and keeps roots cool.

Harvest and Uses in the Kitchen

Your 'Star Ruby' ruby red grapefruit tree will yield generous fruit typically from July through October. The smooth, thin skin peels easily, revealing seedless, richly flavoured segments—perfect for fresh eating, blending in juices, or even turning into marmalade. The beautiful colour and tangy-sweet flavour also uplift seafood dishes, salads, and desserts. Try mixing with other homegrown citrus like Lemon 'Meyer', Orange 'Navelate', or for something bolder, Orange 'Seville' for homemade preserves.

Explore More Citrus Varieties

For those wanting to diversify their citrus orchard, explore the zesty Grapefruit 'Wheeny' for juicing, the aromatic Mandarin 'Afourer', or the tropical notes of Grapefruit 'Hawaiian'. Each variety brings its own unique flavour and growth habit, making it easy to build a productive, interesting collection.

Grow your own ruby red grapefruit tree this season for an abundant harvest of sumptuous, vitamin-rich fruit—perfect for sharing, juicing, and enjoying right out of the garden.


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Whether you need assistance finding the plant you’re looking for or you simply want to know more about who we are and what we do, we invite you to get in touch with us today. A member of The Plant Company team will get back in touch as soon as possible.

–The Plant Company

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